package cn.antho.filter;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.cloud.gateway.filter.GatewayFilter;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.core.Ordered;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.Date;

public class RequestTimeFilter implements GatewayFilter, Ordered {

    private static final Logger log = LoggerFactory.getLogger(RequestTimeFilter.class);

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        log.info("request path: {}", exchange.getRequest().getURI().getPath());
        exchange.getAttributes().put("startTime", new Date().getTime());
        return chain.filter(exchange).then(Mono.fromRunnable(() -> {
            // 开始时间
            Long startTime = exchange.getAttribute("startTime");
            // 结束时间
            Long endTime = (System.currentTimeMillis() - startTime);
            // 打印当前请求耗时
            log.info(exchange.getRequest().getURI().getRawPath() + ": " + endTime + "ms");
        }));
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
